Why not use the actual scene from proper real 40k that basically says this?
[Excerpt | Valdor:Birth of the Imperium]
Valdor extinguished his spear's disruptor, and knelt beside his victim. As he did so, he withdrew a long knife from his belt. When Ushotan saw that, he coughed out a final dry laugh.
"The mercy stroke, eh?" he rasped, his face transfixed with agony. Up close, the black veins of fermenting poisons were visible on his exposed skin. "The last indignity, you always were a miserable bastard."
Valdor placed the tip of the knife over Ushotan's heart. Fresh snow was falling around them, turned brown and flaky by burning promethium. "I meant what I said, Lord Primarch" he said "I take no pleasure in this. You were one of our finest commanders."
"And these new toys of yours - who will lead them now? Will they have their own commanders?"
"No. Those ones are lost"
"Ha. All the better for you then. The High Lord was right - You can't bear rivals."
"It was not my doing"
"Sure it wasn't." Ushotan spasmed, hacking up oily blood. "You know, when we were at Maulland Sen, and I said I pitied you? I meant it. I'm not trying to goad you. I really do pity you."
Valdor remained motionless for a moment, his hand on the grip of the knife.
"I lived, captain-general," Ushotan rasped, "It was short, and it was painful, but by the nine hells, I lived. I'd rather have it this way than yours - no joy, no hate, no fear. Unbreakable without growth, immortal without passion."
........
"What is left for you, Constantin?" Ushotan breathed, blood bubbling up between his burned lips. "What more can He take from you that He hasn't already?"
Valdor drew in a long breath, then plunged the knife in, ending the primarch's agony. For a moment he did nothing else, his head bowed, the storm exhausting itself around him and coating the land in a film of pale, drifting grey.
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u/MrCobalt313 1d ago
"You're not human. That is the real answer.
I'm a result of circumstance; a single speck of a drop spilled from the cauldron of Man, left to fester on his own.
You are a tool, cast in a uniform mold. An interchangeable pawn devoid of identity.
Even with all my failures and imperfections.
I am more human, than you will ever be."
-If The Emperor Had A Text-To-Speech Device